(.. xx ) -b Pos1 pos2 : m.n , , bdfinr. +m.n (n+1) (m+1) . .n .0. -b, n (m+1) ; +m.0b - (m+1) . -m.n n ( ) m . n , .0, m . -b, n - (m+1) ; -m.1b - (m+1) . , . , - . . 1. infile - sort +1 -2 infile 2. infile1 infile2, outfile. sort -r -o outfile +1.0 -1.2 infile1 infile2 3. infile1 infile2 sort -r +1.0b -1.1b infile1 infile2 4. passwd, - UID ( , - :) sort -t: +2n -3 /etc/passwd 5. infile, sort -um +2 -3 infile 3.16. wc - ,  : wc [ -lwc ] [ <> ... ] wc , , - , . . - , . l, w c , , , - . -lwc. , - .